Hibernation is enabled in Windows 8 by default but not shown in power menu. However, you might want to get easy access to in order to avoid shutting down your system and also save your work. If a PC is hibernated when turned on it will restore your opened programs as the previous state of system is saved on hard disk using hibernation file.
If you want to ACTUALLY enable or disable it on system level in Windows 8. Follow these steps. Else, skip to show Hibernate Option in Power Menu in Windows 8.
Launch Command Prompt as Administrator.
To Disable hibernation in Windows 8, type
powercfg /h OFF
To Enable hibernation in Windows 8, type
powercfg /h ON
Show Hibernate Option in Windows 8 Power Menu:
To show hibernation in power menu, open Classic Control Panel in Windows 8.
Go to Power Options.
Press or Click on “Choose what the power buttons do ” in left pane.
Select “Change settings that are currently unavailable”.
Check “Show Hibernate” which is unchecked by default.
Let us know in comments if you encounter any problem.